Jewel and pivot gage.



5 P. R. COATS.

JEWEL AND PIVOT GAGE.

APPLICATION FILED AUG. 9, 1907.

PATENTED APR. 28, 1908.

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JEWEL" AND,

Specification" of Letters Patent. Applieationflled August 9, 1907. Serial No. 887,948.

PIVOT GAGE.

Patented April 28, 1908.

To all whom it may concern: Be it known that I, FRED R. COA'1 S,-'8,'citizen of the United States, residing at Springfield, in the county of- Sangamon and State of Illinois, have invented a new and'useful Jewel and Pivot Ga e,-'of which the following is such a full, 0 ear, and exact descrip-- tion as will enable others skilled in the art to which it ,appertains to make. and use my said inventlon. I

This inventlon relates to gages such as are used by watch makers and repairers to as-..

certain the diameter of a pivot corresponding to the hole of a given ewel, or to ascertam the size of the hole of a jewel corresponding to a pivot'of given diameter.

The purpose of this invention is to provide a gage equipped with a number of pivots of standard sizes, and a corresponding number of jewels of standard sizes, and provided with designations indicating the different sizes of pivots and corresponding jewels.

My invention consists in the novelfeatures of construction and combinations ofarts shown in the annexed drawing to whic reference is hereb made, and hereinafter particularly descri ed and finally recited in the claims. r

Figure 1 is a top plan on an exaggerated scale of the complete device; Fig. 2 is an enlarged vertical transverse section on the line 2 2 of Fig. 1. Fig. 3' is a greatly enlarged vertical transverse section through one of the jewels, its setting, and the retainin plate.

Similar reference numerals and c aracters designate like arts in the several views.

The block 1 is of wood and has in its edges longitudinal grooves 1 to facilitate the handling of the instrument and longitudinal channels 1 and 1 accommodating'the retaining plates. l The retaining plates 2 and 2 are ofbrass or other suitable material and are secured by 2" in the channels 1 and 1 respectively.

Vertical, cylindrical, steel posts 3 fit tightly in holes 2 in the retaining plate: 2 and each post has a'hardened and ground piviot 3'. The pivots 3' vary in size, from; size 8 (standardjewelers gage) to size 21, as

indicated. by the designatlons 8 'to 21 inclusive, inscribed on the upper surface of they tings 4' has a central conical recess 4 extendmg through the major partof the setting and a recess 4 in the upper part. of the setting and adapted to-accommodate the jewel 5.

The jewels 5 are referably sapphire and have; holes {5' gaged to sizes corresponding to the designations inscribed on the face of the block; and the jewels of the different sizes are located on the block opposite to the corresponding pivot, that is to say, the jewel of ,8 gage is op osite to the pivot of 8 gage;.the jewel o 9 gage is o posite to the pivot of 9" gage, and so on throughout the entire series of ewels andpivots.

The jewels 5 are secured in the settings 4 by burs 4 spun around the upper edgeof the jewel. Y

The channels 1* and 1 are of such depth.

of the block and will be protected from injury by articles striking against the jewels or pivots; or by the jewels or pivots rubbing on surfaces which might injure them when the block is inverted.

In practice the artisan wishing to replace a damaged pivot will test the size of the pivot by insert' it in the holes of different jewels until he fin s the jewel of the proper size, and the designation adjacent to that jewelwill indicate the size of the pivot which he is to use; and in like manner if he wishes to replace a broken or dama ed jewel he will test it on difierent pivots til he finds the pivot fitting the jewel and the designation adjacent to the ivot will indicate the gage of the jewel which he seeks.

The practical advantages of the. jewel and pivot age herein shown and described are that 'al the measurements conform to the standards generally used by jewel and watch 'makers; the use of the gage obviates the con fusion caused by gages of varying and uncertain standards; and the size of the jewel or pivot may be quickly and accurately determined. a

Having fully described my invention what I claim .asnew Patent is:

tion of a block having longitudinal channels and ga e-designations intermediate 'of said channe s, retaining. plates fitting in said channels respectively, posts secured on one" 1. In a jewel and pivot gage the combina-- look; a jewel-ret of said retaining plates and having pivots of standard ge corresponding to the d tions on t e block, and jewels mounte on the other retaining plate and having. holes corresponding to the designations on said blocks respectively. 7

2. In a ewel and-pivot gage, the combination of a block having longitudinal channels of a depth suflicient to protect the upper part'of ivots and jewels mounted within the chaune of said block and having intermediof said jewels bemg below the upper surface of said plate. I

3. In a 'ewel and pivot gage, the combination of a b 00!: having longitudinal channels,

and intermediate-gage-designations, a ostretaining plate secured in one of said c annels, posts secured on said post-retaining plate adjacent to said designations respectively and having pivots corres onding to said gage-designations respective y; a jewelreta' plate secured in the other channel of said lock and having holes respectively adjacent to the gage-designations on said block and adapted to accommodate jewel settings, jewel-settings fitting in said holes respectively, and 'ewels mounted on said jewel-settings and aving holes corres 0nding to the gage-designations on said lock res ctively.-

witness whereof I have hereunto sub- I scribed In name at Springfield Illinois, this 6th day 0 August 1907.

' FRED R. COATS.

Witnesses:

Fosm'cn W. BROWN, W. K. HALE. 

